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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2009 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.util.concurrent;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.base.Throwables;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.concurrent.Executor;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>/**<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Base class for services that do not need a thread while "running"<a name="line.25"></a>
<span class="sourceLineNo">026</span> * but may need one during startup and shutdown. Subclasses can<a name="line.26"></a>
<span class="sourceLineNo">027</span> * implement {@link #startUp} and {@link #shutDown} methods, each<a name="line.27"></a>
<span class="sourceLineNo">028</span> * which run in a executor which by default uses a separate thread<a name="line.28"></a>
<span class="sourceLineNo">029</span> * for each method.<a name="line.29"></a>
<span class="sourceLineNo">030</span> *<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @author Chris Nokleberg<a name="line.31"></a>
<span class="sourceLineNo">032</span> * @since 1.0<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>@Beta<a name="line.34"></a>
<span class="sourceLineNo">035</span>public abstract class AbstractIdleService implements Service {<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>  /* use AbstractService for state management */<a name="line.37"></a>
<span class="sourceLineNo">038</span>  private final Service delegate = new AbstractService() {<a name="line.38"></a>
<span class="sourceLineNo">039</span>    @Override protected final void doStart() {<a name="line.39"></a>
<span class="sourceLineNo">040</span>      executor().execute(new Runnable() {<a name="line.40"></a>
<span class="sourceLineNo">041</span>        @Override public void run() {<a name="line.41"></a>
<span class="sourceLineNo">042</span>          try {<a name="line.42"></a>
<span class="sourceLineNo">043</span>            startUp();<a name="line.43"></a>
<span class="sourceLineNo">044</span>            notifyStarted();<a name="line.44"></a>
<span class="sourceLineNo">045</span>          } catch (Throwable t) {<a name="line.45"></a>
<span class="sourceLineNo">046</span>            notifyFailed(t);<a name="line.46"></a>
<span class="sourceLineNo">047</span>            throw Throwables.propagate(t);<a name="line.47"></a>
<span class="sourceLineNo">048</span>          }<a name="line.48"></a>
<span class="sourceLineNo">049</span>        }<a name="line.49"></a>
<span class="sourceLineNo">050</span>      });<a name="line.50"></a>
<span class="sourceLineNo">051</span>    }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>    @Override protected final void doStop() {<a name="line.53"></a>
<span class="sourceLineNo">054</span>      executor().execute(new Runnable() {<a name="line.54"></a>
<span class="sourceLineNo">055</span>        @Override public void run() {<a name="line.55"></a>
<span class="sourceLineNo">056</span>          try {<a name="line.56"></a>
<span class="sourceLineNo">057</span>            shutDown();<a name="line.57"></a>
<span class="sourceLineNo">058</span>            notifyStopped();<a name="line.58"></a>
<span class="sourceLineNo">059</span>          } catch (Throwable t) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>            notifyFailed(t);<a name="line.60"></a>
<span class="sourceLineNo">061</span>            throw Throwables.propagate(t);<a name="line.61"></a>
<span class="sourceLineNo">062</span>          }<a name="line.62"></a>
<span class="sourceLineNo">063</span>        }<a name="line.63"></a>
<span class="sourceLineNo">064</span>      });<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span>  };<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>  /** Constructor for use by subclasses. */<a name="line.68"></a>
<span class="sourceLineNo">069</span>  protected AbstractIdleService() {}<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>  /** Start the service. */<a name="line.71"></a>
<span class="sourceLineNo">072</span>  protected abstract void startUp() throws Exception;<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>  /** Stop the service. */<a name="line.74"></a>
<span class="sourceLineNo">075</span>  protected abstract void shutDown() throws Exception;<a name="line.75"></a>
<span class="sourceLineNo">076</span><a name="line.76"></a>
<span class="sourceLineNo">077</span>  /**<a name="line.77"></a>
<span class="sourceLineNo">078</span>   * Returns the {@link Executor} that will be used to run this service.<a name="line.78"></a>
<span class="sourceLineNo">079</span>   * Subclasses may override this method to use a custom {@link Executor}, which<a name="line.79"></a>
<span class="sourceLineNo">080</span>   * may configure its worker thread with a specific name, thread group or<a name="line.80"></a>
<span class="sourceLineNo">081</span>   * priority. The returned executor's {@link Executor#execute(Runnable)<a name="line.81"></a>
<span class="sourceLineNo">082</span>   * execute()} method is called when this service is started and stopped,<a name="line.82"></a>
<span class="sourceLineNo">083</span>   * and should return promptly.<a name="line.83"></a>
<span class="sourceLineNo">084</span>   */<a name="line.84"></a>
<span class="sourceLineNo">085</span>  protected Executor executor() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>    final State state = state();<a name="line.86"></a>
<span class="sourceLineNo">087</span>    return new Executor() {<a name="line.87"></a>
<span class="sourceLineNo">088</span>      @Override<a name="line.88"></a>
<span class="sourceLineNo">089</span>      public void execute(Runnable command) {<a name="line.89"></a>
<span class="sourceLineNo">090</span>        MoreExecutors.newThread(serviceName() + " " + state, command).start();<a name="line.90"></a>
<span class="sourceLineNo">091</span>      }<a name="line.91"></a>
<span class="sourceLineNo">092</span>    };<a name="line.92"></a>
<span class="sourceLineNo">093</span>  }<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>  @Override public String toString() {<a name="line.95"></a>
<span class="sourceLineNo">096</span>    return serviceName() + " [" + state() + "]";<a name="line.96"></a>
<span class="sourceLineNo">097</span>  }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>  // We override instead of using ForwardingService so that these can be final.<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>  @Override public final ListenableFuture&lt;State&gt; start() {<a name="line.101"></a>
<span class="sourceLineNo">102</span>    return delegate.start();<a name="line.102"></a>
<span class="sourceLineNo">103</span>  }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>  @Override public final State startAndWait() {<a name="line.105"></a>
<span class="sourceLineNo">106</span>    return delegate.startAndWait();<a name="line.106"></a>
<span class="sourceLineNo">107</span>  }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>  @Override public final boolean isRunning() {<a name="line.109"></a>
<span class="sourceLineNo">110</span>    return delegate.isRunning();<a name="line.110"></a>
<span class="sourceLineNo">111</span>  }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span>  @Override public final State state() {<a name="line.113"></a>
<span class="sourceLineNo">114</span>    return delegate.state();<a name="line.114"></a>
<span class="sourceLineNo">115</span>  }<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>  @Override public final ListenableFuture&lt;State&gt; stop() {<a name="line.117"></a>
<span class="sourceLineNo">118</span>    return delegate.stop();<a name="line.118"></a>
<span class="sourceLineNo">119</span>  }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>  @Override public final State stopAndWait() {<a name="line.121"></a>
<span class="sourceLineNo">122</span>    return delegate.stopAndWait();<a name="line.122"></a>
<span class="sourceLineNo">123</span>  }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>  @Override public final void addListener(Listener listener, Executor executor) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>    delegate.addListener(listener, executor);<a name="line.126"></a>
<span class="sourceLineNo">127</span>  }<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>  /**<a name="line.129"></a>
<span class="sourceLineNo">130</span>   * Returns the name of this service. {@link AbstractIdleService} may include the name in debugging<a name="line.130"></a>
<span class="sourceLineNo">131</span>   * output.<a name="line.131"></a>
<span class="sourceLineNo">132</span>   *<a name="line.132"></a>
<span class="sourceLineNo">133</span>   * @since 14.0<a name="line.133"></a>
<span class="sourceLineNo">134</span>   */<a name="line.134"></a>
<span class="sourceLineNo">135</span>  protected String serviceName() {<a name="line.135"></a>
<span class="sourceLineNo">136</span>    return getClass().getSimpleName();<a name="line.136"></a>
<span class="sourceLineNo">137</span>  }<a name="line.137"></a>
<span class="sourceLineNo">138</span>}<a name="line.138"></a>




























































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